Need Help for Rocker Bogie Motion Analysis

Hi Guys,

I need help with Motion Analysis of a Rocker Bogie that simulates and analyzes the motion of Rocker Bogie while moving along a path and climbing to the higher region. I have attached the files here.

I tried doing that by giving hinge mates to the moving parts and parallel mates to keep the Rocker-Bogie on the surface and assigned motor @ 20 rpm. What happened was that the Rocker-Bogie started rotating about its axis and along the surface; but never on the surface following the surface.

Please help.

Thanks in advance.

-Niket.

SolidworksMotion Studies